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.O `AGRICULTURAL Analytical Chemists March 21, 2023 Lab No. : STK2333064-001 San Joaquin Co. Environmental Health Dep Customer No.: 3017919 Water Quality Division Attn: Steven Shih Sampled On : March 8, 2023 at 11:00 1868 East Hazelton Ave. Sampled By : Aaron Gooderham Stockton, CA 95205 Received On : March 8, 2023 at 11:45 Description Wellhead Matrix : Drinking Water Project 30331 Lone Tree Rd-WP0041564 Sample Results - Inorganic 91 • .. General Mineral Date Time Who Method Date Time Who Total Hardness as CaCO3 211 2.5 mg/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Calcium 45 1 mg/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Magnesium 24 1 mg/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Potassium 3 1 mg/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Sodium 26 1 mg/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Total Cations 5.4 --- meq/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Boron ND 0.1 mg/L 1 J 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Copper 40 10 ug/L 10002 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Iron ND 30 ug/L 3002 1 J 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Manganese ND 10 ug/L 502 1 J 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Zinc 20 20 ug/L 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac SAR 0.8 0.1 1 03/10/2023 08:00 ac EPA 200.7 03/10/2023 11:42 ac Total Alkalinity(as CaCO3) 210 10 mg/L 1 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm Hydroxide as OH ND 10 mg/L 1 UI 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm Carbonate as CO3 ND 10 mg/L 1 UI 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm Bicarbonate as HCO3 260 10 mg/L 1 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm Sulfate 34.1 0.5 mg/L 5002 1 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Chloride 11 1 mg/L 5002 1 b 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Nitrate as NO3 37.4 0.4 mg/L 45 1 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Nitrite as N ND 0.1 mg/L 1 1 U 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Nitrate+Nitrite as N 8.5 0.1 mg/L 10 1 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Fluoride 0.2 0.1 mg/L 2 1 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh Total Anions 5.9 --- meq/L 1 Ib 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm pH 7.2 units 1 03/08/2023 11:00 ag 03/08/2023 11:00 ag Specific Conductance 558 1 umhos/cm 16002 1 03/12/2023 21:45 amm SM 4500-H+B 03/13/2023 01:52 amm Total Dissolved Solids 340 20 mg/L 10002 1 03/10/2023 12:08 ctl SM 2540 C 03/13/2023 12:02 ctl MBAS(foaming agents) Negative 0.1 mg/L 0.52 1 U 03/10/2023 08:15 krh SM 5540 C 03/10/2023 08:22 krh Aggressiveness Index 11.6 1 1 03/08/2023 11:00 ag 03/08/2023 11:00 ag Langelier Index(20°C) -0.3 1 1 03/08/2023 11:00 ag 03/08/2023 11:00 ag Nitrate Nitrogen 8.5 0.1 mg/L 10 1 03/09/2023 10:46 ldm EPA 300.0 03/09/2023 23:08 krh DQF Flags Definition: J Reported value is estimated;detected at a concentration below the RL and above the laboratory MDL. U Constituent results were non-detect. I The RPD for the laboratory duplicate exceeded laboratory criteria. b The Blank was positive for constituent but less than the PQL ND=Non-Detected, RL=Reporting Level, Dil.=Dilution MCL= Maximum Contamination Level. 2 - Secondary Standard. 3-CDPH Notification Level.AL= Regulatory Action Level. Section: Sample Results Page 2 of 7 Page 2 of 7 Corporate Offices&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory Office&Laboratory 853 Corporation Street 2500 Stagecoach Road 563 E.Undo Avenue 3442 Empresa Drive,Suite D 9415 W.Goshen Avenue Santa Paula,CA 93060 Stockton,CA 95215 Chico,CA 95926 San Luis Obispo,CA 93401 Visalia,CA 93291 TEL:(805)392-2000 TEL:(209)942-0182 TEL:(530)343-5818 TEL:(805)783-2940 TEL:(559)734-9473 Env FAX:(805)525-4172/Ag FAX:(805)392-2063 FAX:(209)942-0423 FAX:(530)343-3807 FAX:(805)783-2912 FAX:(559)734-8435 CA ELAP Certification No.1573 CA ELAP Certification No.1563 CA ELAP Certification No.2670 CA ELAP Certification No.2775 CA ELAP Certification No.2810